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Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0156-Update-gpio-fan-overlay.dts-2711.patch')
-rw-r--r--target/linux/brcm2708/patches-4.19/950-0156-Update-gpio-fan-overlay.dts-2711.patch72
1 files changed, 72 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0156-Update-gpio-fan-overlay.dts-2711.patch b/target/linux/brcm2708/patches-4.19/950-0156-Update-gpio-fan-overlay.dts-2711.patch
new file mode 100644
index 0000000000..c8f375942e
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0156-Update-gpio-fan-overlay.dts-2711.patch
@@ -0,0 +1,72 @@
+From 4a2be174938ac115beac4f07fa8b7ee33406cde8 Mon Sep 17 00:00:00 2001
+From: Paul <paulenuta@users.noreply.github.com>
+Date: Thu, 11 Oct 2018 12:17:20 +0300
+Subject: [PATCH] Update gpio-fan-overlay.dts (#2711)
+
+Add references, links, clear details, some typo correction.
+---
+ .../boot/dts/overlays/gpio-fan-overlay.dts | 36 +++++++++++--------
+ 1 file changed, 22 insertions(+), 14 deletions(-)
+
+--- a/arch/arm/boot/dts/overlays/gpio-fan-overlay.dts
++++ b/arch/arm/boot/dts/overlays/gpio-fan-overlay.dts
+@@ -1,29 +1,37 @@
+ /*
+ * Overlay for the Raspberry Pi GPIO Fan @ BCM GPIO12.
++ * References:
++ * - https://www.raspberrypi.org/forums/viewtopic.php?f=107&p=1367135#p1365084
++ *
+ * Optional parameters:
+- * - "gpiopin" - default GPIO12
+- * - "temp" - default 55000
++ * - "gpiopin" - BCM number of the pin driving the fan, default 12 (GPIO12);
++ * - "temp" - CPU temperature at which fan is started in millicelsius, default 55000;
++ *
+ * Requires:
+- * - kernel configurations: CONFIG_SENSORS_GPIO_FAN=m and CONFIG_SENSORS_PWM_FAN=m;
+- * - kernel rebuid;
+- * - DC Fan connected to GPIO via a N-MOSFET (2N7002)
++ * - kernel configurations: CONFIG_SENSORS_GPIO_FAN=m;
++ * - kernel rebuild;
++ * - N-MOSFET connected to gpiopin, 2N7002-[https://en.wikipedia.org/wiki/2N7000];
++ * - DC Fan connected to N-MOSFET Drain terminal, a 12V fan is working fine and quite silently;
++ * [https://www.tme.eu/en/details/ee40101s1-999-a/dc12v-fans/sunon/ee40101s1-1000u-999/]
+ *
+ * ┌─────────────────────┐
+ * │Fan negative terminal│
+ * └┬────────────────────┘
+- * │
+- * │──┘
++ * │D
++ * G │──┘
+ * [GPIO12]──────┤ │<─┐ 2N7002
+ * │──┤
+- * │
++ * │S
+ * ─┴─
+ * GND
+ *
+- * sudo dtc -W no-unit_address_vs_reg -@ -I dts -O dtb -o /boot/overlays/gpio-fan.dtbo gpio-fan.dts
+- * sudo nano /boot/config.txt add "dtoverlay=gpio-fan" or "dtoverlay=gpio-fan,gpiopin=12,temp=45000"
+- * or
+- * sudo sh -c "echo '\n# Enable PI GPIO-Fan\ndtoverlay=gpio-fan\n' >> /boot/config.txt"
+- * sudo sh -c "echo '\n# Enable PI GPIO-Fan\ndtoverlay=gpio-fan,gpiopin=12\n' >> /boot/config.txt"
++ * Build:
++ * - `sudo dtc -W no-unit_address_vs_reg -@ -I dts -O dtb -o /boot/overlays/gpio-fan.dtbo gpio-fan-overlay.dts`
++ * Activate:
++ * - sudo nano /boot/config.txt add "dtoverlay=gpio-fan" or "dtoverlay=gpio-fan,gpiopin=12,temp=45000"
++ * or
++ * - sudo sh -c 'printf "\n# Enable PI GPIO-Fan Default\ndtoverlay=gpio-fan\n" >> /boot/config.txt'
++ * - sudo sh -c 'printf "\n# Enable PI GPIO-Fan Custom\ntoverlay=gpio-fan,gpiopin=12,temp=45000\n" >> /boot/config.txt'
+ *
+ */
+ /dts-v1/;
+@@ -52,7 +60,7 @@
+ trips {
+ cpu_hot: trip-point@0 {
+ temperature = <55000>; /* (millicelsius) Fan started at 55°C */
+- hysteresis = <5000>; /* (millicelsius) Fan stopped at 50°C */
++ hysteresis = <10000>; /* (millicelsius) Fan stopped at 45°C */
+ type = "active";
+ };
+ };